70 MANUAL OF HUMAN PROTOZOA 



large homogeneous body which is not iodinophilous, but 

 when fixed and stained is more or less eosinophilous. In 

 some individuals, the cvtoplasmic ring may be thick and 

 the enclosed body very small. This organism has often 

 been confused with the cysts of intestinal protozoa. Divid- 



# O 



1^5^ 



') I J I J CD 



J 4 ^ ^ 8 



Fig. 16. 1. Sphaerita in a stained trophozoite of Entamoeba coli. 



2. Nucleophaga in a stained trophozoite of lodamoeba biitschlii. 



3, 4. Fresh specimens of Blastocystis hominis. 

 5, 6. Stained specimens of Blastocystis hominis. 



7. An epithehal cell found in faeces. 



8. A polymorphonuclear leucocyte with three ingested erythro- 



cytes. 

 All X 1150 (1, after Noller; 2, after Brug; 3-8, original). 



ing forms may appear peanut-shaped (Fig. 16, 6). It is 

 considered as a harmless organism. 



Helminth eggs. In faeces of persons infected by various 

 helminth parasites, eggs of the worms occur commonly. 

 Some of these eggs, especially of nematodes, may resemble 

 superficially the oocysts of Isospora hominis (p. 47-49) in 

 general form and appearance, but can easily be distin- 



